Malicious PDF — malware analysis report

Static analysis result for SHA-256 935ed6a572e62ddb…

MALICIOUS

PDF

79.0 KB Created: 2021-08-06 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d49699a5efdb4727bc3c99824d63f73 SHA-1: 2a389d6382ff110488fbf51bfab69c21b7b314ff SHA-256: 935ed6a572e62ddb6fa83a35f4367b42e87cf3ea6b8292a666b9a85e2a2c22cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://regiefranchet.fr/userfiles/files/60110183148.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-6/20210806183549768364.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/roxavodedewasuwofagixe.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/nirixewowabegokiwofu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/76019874215.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f5e87d92---29162987958.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad90c47ef---lebodaxaru.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/2936145764.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/35062214752.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/mizalede.pdfIn PDF document text
    • https://saam.vn/images/content/file/wifofekuga.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090248a4570e---94122142195.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7442beaf08---poladubisupe.pdfIn PDF document text
    • https://tekartltd.com/upload/files/51861533180.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedd5eac35---lorijawixolugazozosag.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tanel.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160870bd4a1b87---togaxuziboxenupinuxedize.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/39076749616.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/17217806907.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/muvosuwewojo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mpl8ra1cejacda1nj2j741fp57/gatipupi.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/33323383198.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/7960911874.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/favawazaboxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=a+raisin+in+the+sun+discussion+questions+quizletPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 18400 bytes
SHA-256: e24e6dbb5f184fdbf6f5a77391868cc01f5907a440249e5805d983c5b7fe0522
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 10756 bytes
SHA-256: ca0ccfdabbbb7a9012260e98389ceba50801fcecdf6daf6c93610465f4f44eaf